不同纽配结构水泥稳定穆砾材料CT试验分析

利用工业CT三维扫描成像技术，进行了3类典型级配结构对比试验，分析了不同结构水泥稳定砂砾材料在过载条件下破坏前、后的微观特性．研究结果表明：悬浮密实结构、骨架密实结构及骨架空隙结构这3种典型级配结构的空隙率主要受最大空隙体积的影响；骨架密实型结构大粒径骨料破坏后形成的较小骨料和胶结料形成的整体仍有一定的强度，该结构抗疲劳破坏潜力较大；优化水泥稳定砂砾基层级配结构可有效增强其抗破坏能力．该研究成果对干旱荒漠区公路工程施工和设计具有指导作用．

The industrial CT experiment of different grading structure cement-stabilized sand gravel materials

Using industrial computed tomography （CT）, three-dimensional （3D） laser imaging technology grading for three kinds of typical structure is studied. Different structure cement-stabilized sand gravel materials are analyzed in an overload condition of microcosmic character. Results show that suspend-dense structure （SDS）, framework- dense structure（FDS） and framework-void structure（FVS）of three kinds of typical structure of the porosity was mainly affected by the maximum gap. FDS inside the larger particle size of aggregates~ damage after the smaller aggregates with binder to form the overall aggregates has a certain strength. Fatigue resistance with this kind of structure is better. The optimization of the structure of cement stabilized gravel base can effec- tively enhance its ability against damage. The above results can be as a guidance for arid ~desert region highway engineering construction and design.